1.1.4 SIP-VoIP common problems

Hey i gotta a few questions for anyone who can help me out there. I am running 1.1.4 jailbroken(via ziphone) 16gb ipod and have installed sip/voip 1.1 on it. The common errors I keep getting are once putting all my settings in, it always forgets it the next time it open the app. The other problem I have is that once I dial a number, the number i have dialed disappears and the hangup button freezes red, and it doesn't allow you to press it. Can anybody help me out?